A van drove into a crowd of people on Las Ramblas, a popular tourist and commercial street in Barcelona, Spain, in an August 17, terror attack killing 13 people and injuring more than 100 others. ISIS has claimed responsibility.

Nicolas Carvalho Ochoa / Getty Images

A second vehicle attack in the nearby town of Cambrils also killed one woman. Police fatally shot five suspected terrorists.

Stringer . / Reuters

And man who was fatally stabbed in a town near Barcelona was later linked to the attack, raising the death toll to 15.

David Ramos / Getty Images

People from at least 34 countries were affected, including France, Spain, China, Australia, Italy, Argentina, the Netherlands, Venezuela, Ireland, Peru, and Algeria.

As information trickles out about the victims, here's what we know about them:

Julian Cadman, 7

Facebook

On Sunday 20 August, the family of seven-year-old Julian Cadman, a British-Australian dual national, said he had died in the Barcelona attack.

His family in the UK had appealed for information on Facebook after he apparently became separated from his mother, who was wounded in the Las Ramblas attack.

But in a statement released through the UK Foreign Office, Julian's family said he had died.

"Julian was a much loved and adored member of our family. As he was enjoying the sights of Barcelona with his mother, Julian was sadly taken from us. He was so energetic, funny and cheeky, always bringing a smile to our faces. We are so blessed to have had him in our lives and will remember his smiles and hold his memory dear to our hearts," the statement said.

"We would like to thank all those who helped us in searching for Julian. Your kindness was incredible during a difficult time. We also acknowledge we are not the only family to be affected by the events, our prayers and thoughts are with all people affected."

The family said they will "not be making any further comments on this tragedy."

Belgium's deputy prime minister, Didier Reynders, confirmed that a 44-year-old woman was among the victims and offered condolences to her family.

Elke Vanbockrijck, was on vacation with her husband and sons. Local media announced that a condolence book for Vanbockrijck would be opened to the public on Aug. 21.

Reynders also confirmed that two Belgians were wounded in the attack, and one was seriously injured.

On Thursday night, Patrick Dewael, a mayor in Belgium, announced that a woman from his town, Tongeren, had died. Dewael told Belgium radio that he had presided over the woman's wedding in 2014, the Associated Press reported.

Luca Russo, 25

Another Italian citizen who died was identified as Luca Russo, according to officials.

The 25-year-old engineering graduate was on holiday with his fiancé, Marta Scomazzon, who was injured in the attack.

On Facebook, the president of Veneto, Italy, Luca Zaia, said that Veneto has lost one of its children. He also said that the flags on regional buildings will be placed at half-mast as a sign of mourning for Russo.

Ian Moore Wilson, 53

"It was with great sadness that I learned today that one Canadian was killed and four others injured during yesterday’s cowardly terrorist attack in Barcelona," Canadian prime minister Justin Trudeau said. "Sophie and I offer our condolences to the families and friends in mourning, and hope for a speedy recovery for the injured Canadians."

He was identified by his daughter, Vancouver Police Department Staff Sgt. Fiona Wilson.

"He was compassionate, generous, adventurous, and always game for a lively debate, a good book, exploring new places, and a proper-sized pint," Wilson wrote in a statement released by the Vancouver Police Department. "In the midst of this tragedy, my dad would want those around him to focus on the extraordinary acts of human kindness that our family has experienced in the past several days, and that is exactly what we intend to do."

Wilson said her, mother, Valerie, was also injured in the attack but is being treated in Catalonia.

Silvina Alejandra Pereyra, 40

Silvina Alejandra Pereyra had lived in Barcelona for the last 10 years, Argentina's Ministry of Foreign Affairs said in a statement.

"The Argentine government is saddened by the pain to her family members and loved ones due to her death, and the Barcelona consulate, as well as the Spanish embassy will maintain in contact to coordinate assistance with this case," the statement reads